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Articles by Doc Mike Finnley

19th Century

Holography, Part Four

9th September 2020 Doc Mike Finnley 0

Holograph Examples The PFG-01 holographic film that I’ve used in the examples below is ideally suited to making transmission holograms but it can also be used to make reflection holograms. Reflection Holograms One of the [more…]

19th Century

Holography, Part Three

2nd September 2020 Doc Mike Finnley 0

A Simple Dual Beam Setup We’ve got our film, developer and a safety lamp. Now we need a holographic camera. Well, not exactly a camera. You can’t take a picture of rolling hills or a [more…]

Doc Mike Finnley, Going Postal
19th Century

Holography, Part Two

26th August 2020 Doc Mike Finnley 0

A Holographic Camera Standard photography uses a lens system to focus an image onto a film or an electronic sensor. If you recall from part one, Dennis Gabor had a problem with his electron microscope’s [more…]

Doc Mike Finnley, Going Postal
19th Century

Holography, Part One

19th August 2020 Doc Mike Finnley 0

Introduction To the Looking-Glass world it was Alice that said, “I’ve a sceptre in hand, I’ve a crown on my head. Let the Looking-Glass creatures, whatever they be Come dine with the Red Queen, the [more…]

Doc Mike Finnley, Going Postal
20th Century

Happy Birthday, Ruby!

16th May 2020 Doc Mike Finnley 0

Above photo: My ruby laser with a ‘mirror alignment laser’ just off to the right hand side of the photo. A small amount of smoke in the air makes the alignment laser-beam visible. In the [more…]

Engineering

Making A Ruby Laser – Part Five

25th September 2018 Doc Mike Finnley 0

Melting a hole through steel: The above image needs a little explanation! The Doc messed up his camera settings and under exposed the image. So I loaded it into Gimp and played with the curves [more…]

Engineering

Making A Ruby Laser – Part Four

11th September 2018 Doc Mike Finnley 0

The Doc’s ruby laser focused onto a lighter flint. The flint has been glued to the end of a match stick. The ‘explosion’ measures approximately 4 inches diameter. Interesting things to note are the ‘candy [more…]

Engineering

Making A Ruby Laser – Part Three

14th August 2018 Doc Mike Finnley 0

More information on laser speckle can be found here:  Speckle pattern A Mirror Alignment Tool The most important part of constructing a ruby laser (or any laser with external mirrors) are getting the mirrors alligned [more…]

Dr Mike Finnley, Going Postal
Engineering

Making A Ruby Laser – Part Two

31st July 2018 Doc Mike Finnley 0

(a ruby rod lit by two bright blue LEDs. Due to the IR filter in my camera the pink colour is actually red. What you are seeing is the absorption of the blue light and the [more…]

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Elsewhere on GP

  • Evolution of a Puffin

    4th January 2021 0
    Towards the end of November in this crazily craptacular COVID-19-filled year, I had a chat about fishing flies in the comments no-one reads with a fellow Postaller. More to the point, a natter about whether [more...]
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    26th September 2018 0
    Inspector Angela Griffiths took the call from another officer, who muttered, “Another weird one, but it might be related?” It was the Churchwarden of the church in the village of the missing man, Doctor David [more...]
  • The Internet

    6th January 2018 2,527
    “Commodore VIC-20” by Soupmeister is licensed under CC BY-SA 2.0 So there I was, at 16, with my Commodore 64, a Programmers Reference Guide and no assembler, translating assembly instructions into hexadecimal opcodes, by hand, [more...]
  • Review – The Strange Death of Europe, by Douglas Murray

    28th July 2017 0
    “File:Douglas Murray (2).png” by Elekes Andor is licensed under CC BY-SA 4.0 Much has been made of Douglas Murray’s Strange Death of Europe.  I’ve just finished it and present a quick review.  Needless to say, [more...]
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